This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 9 |
| 5 | 55 |
| 6 | 286 |
| 7 | 1365 |
| 8 | 6188 |
| 9 | 27132 |
| 10 | 116280 |
| 11 | 490314 |
| 12 | 2042975 |
| 13 | 8436285 |
| 14 | 34597290 |
| 15 | 141120525 |
| 16 | 573166440 |
| 17 | 2319959400 |
| 18 | 9364199760 |
| 19 | 37711260990 |
| 20 | 151584480450 |
| 21 | 608359048206 |
| 22 | 2438362177020 |
| 23 | 9762479679106 |
| 24 | 39049918716424 |
| 25 | 156077261327400 |
| 26 | 623404249591760 |